Design Pressure (DP) ratings

Design Pressure Rating to Wind Speed Conversion 

DP Rating DP20 DP25 DP30 DP35 DP40 DP45 DP50 DP55 DP60 DP65
Design Pressure (psf) 20 25 30 35 40 45 50 55 60 65
Structural Test (psf) 30.00 37.50 45.00 52.50 67.50 75 75 82.50 90 97.50
MPH Wind Structural Tes 110 123 134 145 155 164 173 182 190 198
Water Test Pressure 3.00 3.75 4.50 5.25 6.00 6.75 7.50 8.25 9.00 9.75
MPH Wind Water Test 35 39 42 46 49 52 55 57 60 62
Allowable Air Infiltration 1.57 psf (25 mph Wind) 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30 0.30